Insertion of a coronary stent into the Eustachian tube of heathland sheep.

A: View through the bronchofiberscope at both ostia pharyngea (⇒). B: Insertion of a stent through the working channel of the fiberscope. C: Microscopic view of the middle ear. The stent can be moved forward through the isthmus into the middle ear. D: After dilatation of the stent and retraction of the catheter the stent remains in position (view from the middle ear).